CN112081449A

CN112081449A - Insulating cross arm, manufacturing method thereof and power transmission pole

Info

Publication number: CN112081449A
Application number: CN202010922613.6A
Authority: CN
Inventors: 李德权; 金天亮; 徐康; 石朋; 马斌
Original assignee: Jiangsu Shenma Electric Power Co Ltd
Current assignee: Jiangsu Shenma Electric Power Co Ltd
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2020-12-15

Abstract

The invention discloses an insulating cross arm, a preparation method thereof and a power transmission pole, which comprise the following steps: the connecting hardware comprises a sleeve and a sealing part arranged in the sleeve; the core rod comprises a first core rod and a second core rod, one end of the first core rod and one end of the second core rod are fixedly connected to two ends of the sleeve respectively, and the sealing part enables one end of the first core rod and one end of the second core rod to be in sealing connection with the sleeve; the two wire hanging hardware fittings are fixedly connected to the other end of the first core rod and the other end of the second core rod respectively; the insulating layer is fixed on the outer peripheral surface of the mandrel in a wrapping mode, the insulating layer is located in other areas except the connecting hardware fitting and the wire hanging hardware fitting, and the insulating layer is connected with the connecting hardware fitting and the insulating layer is connected with the wire hanging hardware fitting in a sealing mode. The insulating cross arm disclosed by the invention is simple in structure, high in mechanical strength, high in production efficiency, convenient to install, suitable for various rod bodies and universal.

Description

Insulating cross arm, manufacturing method thereof and power transmission pole

Technical Field

The invention relates to the field of power transmission insulating equipment, in particular to an insulating cross arm, a preparation method thereof and a power transmission pole.

Background

In the field of electrical equipment, an insulating cross arm for a transmission line is an important mating structural member of a transmission pole, and is used for supporting a conducting wire, a lightning conductor and the like and keeping a certain safety distance according to regulations. At present, the composite cross arm used in the power transmission line with the voltage level of 35kV or below mostly adopts an integral cross arm sleeved middle hardware fitting, the core rod of the composite cross arm is of a full-length structure, and a part of the composite cross arm is perforated in the middle of the core rod and is used for penetrating a rod body to connect with a hoop; part plug does not punch, therefore the intermediate fitting of adoption is comparatively complicated heavy, leads to the whole weight of cross arm to increase, and needs two hoops fixed, and the installation is comparatively complicated.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide an insulating cross arm, a preparation method thereof and a power transmission pole, which can reduce the weight of the insulating cross arm, simplify the structure and facilitate the installation while ensuring the mechanical strength of the insulating cross arm.

In order to achieve the purpose, the technical means adopted by the invention are as follows: an insulating cross arm comprising: the connecting hardware comprises a sleeve and a sealing part arranged in the sleeve; the core rod comprises a first core rod and a second core rod, one end of the first core rod and one end of the second core rod are fixedly connected to two ends of the sleeve respectively, and the sealing part enables one end of the first core rod and one end of the second core rod to be in sealing connection with the sleeve; the two wire hanging hardware fittings are respectively and fixedly connected to the other end of the first core rod and the other end of the second core rod; and the insulating layer is fixedly coated on the peripheral surface of the mandrel, is positioned in other areas except the connecting hardware fitting and the wire hanging hardware fitting, and is hermetically connected with the connecting hardware fitting and the wire hanging hardware fitting.

The insulating cross arm adopts two core rods as insulating bearing main materials, namely a first core rod and a second core rod respectively, a connecting hardware fitting is adopted in the middle of the cross arm, the left end and the right end of the connecting hardware fitting are respectively sleeved with the first core rod and the second core rod, and the connecting cross arm can be connected with a rod body without punching holes on the core rods or adopting a connecting device with a complex structure; the wire hanging hardware fittings are sleeved at two ends of the cross arm and used for fixedly connecting the wires, and the insulating layers are coated outside the first core rod and the second core rod to protect the core rods and avoid the aging of the core rods.

Preferably, the sleeve is a steel pipe with a hollow structure and is used for sleeving the first core rod and the second core rod.

Preferably, a cushion block is arranged on one side face of the sleeve, and the cushion block is provided with an arc-shaped face which is concave towards the inner side of the sleeve and is used for being connected with the rod body in a matched mode.

Preferably, the cushion block is fixedly connected with the sleeve through welding, the structure is stable, and the operation is simple and convenient.

Preferably, the sealing part comprises a first seal and a second seal, the first seal and the second seal are metal plates or rubber pieces, the outer peripheral surface of the first seal and the outer peripheral surface of the second seal are matched with the inner wall of the sleeve, one end of the first mandrel is abutted against the first seal, one end of the second mandrel is abutted against the second seal, the end parts of the first mandrel and the second mandrel are protected, and the first mandrel and the second mandrel are both in sealing connection with the sleeve.

Preferably, the sealing part is made of rubber materials, fills the inner cavity of the sleeve except for the part connected with the first core rod and the second core rod, protects the end parts of the first core rod and the second core rod, and enables the first core rod and the second core rod to be connected with the sleeve in a sealing mode.

Preferably, two first mounting holes are formed in the side wall of the sleeve along the axial direction of the sleeve, and the two first mounting holes are located between the first core rod and the second core rod and used for penetrating the rod connecting piece to enable the cross arm to be fixedly connected with the rod body.

Preferably, link fitting still includes the angle steel, and the connection strength of link fitting is guaranteed in the setting of sleeve laminating angle steel inside wall.

Preferably, be equipped with two second mounting holes that correspond with two first mounting holes on the angle steel, be equipped with the cushion on the angle steel lateral wall, the cushion is located between two second mounting holes and has the arcwall face towards the inboard sunken of sleeve for be connected with the body of rod cooperation.

In order to achieve the above purpose, another technical solution adopted by the present invention is as follows: the preparation method of the insulating cross arm comprises the following steps:

forming a first core rod, a second core rod, a connecting hardware fitting and two wire hanging hardware fittings;

arranging a sealing part in a sleeve of the connecting hardware fitting and sealing and fixing the sealing part;

one end of a first core rod is fixedly connected with one end of a sleeve in a sealing mode, one end of a second core rod is fixedly connected with the other end of the sleeve in a sealing mode, and the other end of the first core rod and the other end of the second core rod are fixedly connected with two wire hanging hardware fittings respectively to form a piece to be coated;

and integrally coating an insulating layer on the piece to be coated, wherein the insulating layer coats the first core rod and the second core rod except other areas of the connecting hardware fitting and the wire hanging hardware fitting to obtain the insulating cross arm.

In order to achieve the above object, the present invention adopts another technical solution as follows: the preparation method of the insulating cross arm comprises the following steps:

fixedly connecting one end of a first core rod and one end of a second core rod with two ends of a sleeve of a connecting hardware fitting respectively, and fixedly connecting the other end of the first core rod and the other end of the second core rod with two wire hanging hardware fittings respectively to form a piece to be coated;

and integrally coating an insulating layer on the piece to be coated, filling the insulating layer into the inner cavity of the connecting hardware fitting to form a sealing part, and coating the first core rod and the second core rod except other areas of the connecting hardware fitting and the wire hanging hardware fitting by using the insulating layer to obtain the insulating cross arm.

In order to achieve the above object, the present invention adopts another technical solution as follows: the utility model provides a power transmission pole, including the body of rod with fix insulating cross arm on the body of rod, insulating cross arm adopts above-mentioned any one insulating cross arm.

The beneficial effect of this application is: different from the prior art, the mandrel of the cross arm is divided into two parts by respectively fixedly connecting the first mandrel and the second mandrel at two ends of the connecting hardware fitting, so that the mounting hole can be directly formed in the connecting hardware fitting, the rod body connecting piece penetrates through the mounting hole to connect the cross arm with the rod body, and more than two rod body connecting pieces are not needed. The connecting hardware fitting is welded and fixed through the sleeve and the cushion block, and is simple in structure and convenient to install. Meanwhile, the parts of the cross arm core rod except the connecting hardware fitting and the end wire hanging hardware fitting are coated with insulating layers, so that the core rod is protected and prevented from aging. The whole manufacturing process of the insulating cross arm product is simple, the production efficiency is high, and the cost is low. The product sealing performance is better due to the integral injection, and the labor cost and the energy consumption can be reduced due to fewer processes.

Drawings

Fig. 1 is a schematic structural diagram of an insulating cross arm 10 according to a first embodiment of the present invention;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

fig. 3 is a schematic structural diagram of the link fitting 110 according to the first embodiment of the invention;

fig. 4 is a schematic structural diagram of an insulating cross arm 20 according to a second embodiment of the present invention;

fig. 5 is a schematic structural view of an angle iron 212 according to a second embodiment of the present invention;

fig. 6 is a schematic structural view of a transmission pole 01 according to a sixth embodiment of the present invention;

fig. 7 is a schematic structural view of a transmission pole 02 according to a seventh embodiment of the present invention.

Detailed Description

As required, detailed embodiments of the present invention are disclosed herein. However, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed manner, including employing various features disclosed herein in combination with features that may not be explicitly disclosed herein.

The term "connected", as used herein, unless otherwise expressly specified or limited, is to be construed broadly, as meaning either directly or through an intermediate connection. In the description of the present invention, it is to be understood that the directions or positional relationships indicated by "upper", "lower", "end", "one end", etc. are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed in a specific direction and operate, and thus, should not be construed as limiting the present invention.

The first embodiment is as follows:

as shown in fig. 1 and 2, the insulating cross arm 10 includes a link fitting 110, a mandrel 120, an insulating layer 130, and two wire hanging fittings 140, and the mandrel 120 includes a first mandrel 121 and a second mandrel 122. One end of the first core rod 121 and one end of the second core rod 122 are fixedly connected to two ends of the link fitting 110, respectively, and the other end of the first core rod 121 and the other end of the second core rod 122 are fixedly connected to two wire-hanging fittings 140, respectively. The core rod 120 is wrapped by the insulating layer 130, the insulating layer 130 is located in other areas except the connecting hardware fitting 110 and the wire hanging hardware fitting 140, and the insulating layer 130 and the connecting hardware fitting 110 and the insulating layer 130 and the wire hanging hardware fitting 140 are hermetically connected to protect the core rod 120 from aging.

The core rod 120 is made of a composite material, for example, a glass fiber or aramid fiber is impregnated with resin and then is subjected to pultrusion, the composite material is more corrosion-resistant and lower in cost compared with a metal material of a traditional cross arm, and the weight of the insulating cross arm 10 can be reduced. The cross-sectional shape of the mandrel 120 may be square, circular, T-shaped, or i-shaped. The insulating layer 130 is coated on the core rod 120, the insulating layer 130 is made of silicon rubber material, and the silicon rubber material is coated on the periphery of the core rod 120 in an integral injection mode, so that the cost is low, the efficiency is high, of course, the coating mode can also adopt a die pressing process, and the silicon rubber insulating layer can be integrally formed. Meanwhile, the silicon rubber material has good aging resistance and hydrophobic migration performance, so that the probability of pollution flashover and rain flashover can be reduced, and the insulating layer 130 can be made of rubber materials in other forms. In this embodiment, the insulating layer 130 further includes a sheath and a shed disposed on the sheath at intervals. And the upper surface and the lower surface of insulating layer 130 are arc, and when the rainwater fell on insulating layer 130, the rainwater dropped along with curved silicon rubber surface, was favorable to the drainage, prevented that insulating layer 130 surface from influencing electric property because of ponding. Moreover, two grooves 131 (only the groove 131 on the upper surface is shown in the figure) are symmetrically formed on the upper surface and the lower surface of the insulating layer 130 covering the periphery of the first core rod 121 along the axis of the insulating cross arm 10, the surface of the groove 131 is a plane, so that a jumper insulator (not shown in the figure) can be conveniently clamped, and the arrangement of the groove 131 can play a role in marking, so as to remind an installer that the jumper insulator can be installed at the groove 131. Similarly, two grooves 131 are symmetrically provided along the axis of the insulating cross arm 10 on the upper surface and the lower surface of the insulating layer 130 covering the outer periphery of the second core rod 122. Preferably, the grooves 131 on the insulating layer 130 of the first core rod 121 and the grooves 131 on the insulating layer 130 of the second core rod 122 are symmetrically disposed at both sides of the link fitting 110. The wire hanging hardware 140 is used for fixing a wire, and the wire can be fixed on the wire hanging hardware 140 through a binding process, or a gland can be arranged to fix the wire, so that the specific structure of the wire hanging hardware 140 is not limited. Meanwhile, the connecting hardware fitting 110 and the wire hanging hardware fitting 140 may be made of metal materials or composite materials, and the metal materials may be made of metals such as iron, steel, aluminum and the like.

Specifically, as shown in fig. 1 and 3, the link fitting 110 includes a sleeve 111 and a sealing portion disposed inside the sleeve 111, the sleeve 111 is a steel pipe with a hollow structure, one end of a first core rod 121 and one end of a second core rod 122 are fixedly connected to cavities at two ends of the sleeve 111 respectively, and then the core rod 120 and the sleeve 111 are fixed by crimping, but may be fixed by glue as long as the core rod 120 and the sleeve 111 can be stably connected. The inner cavity of the steel tube can be in any shape, such as square, round, T-shaped or I-shaped, and the shape of the inner cavity is consistent with that of the cross section of the core rod 120, so that the contact area between the core rod 120 and the sleeve 111 can be increased as much as possible, the connection is more stable, and the mechanical performance of the insulating cross arm 10 is improved. The steel pipe is the commonly used material, and convenient for material acquisition, the cost is lower, only needs the steel pipe of required length of intercepting and simply processes the back, can regard as sleeve 111 to use. And the outer surface of the sleeve 111 needs a zinc coating to prevent the surface of the sleeve 111 from being corroded, and the service life is prolonged. Meanwhile, two first mounting holes 112 are further formed in the sleeve 111 along the axial direction of the insulating cross arm 10 and used for penetrating through a rod body connecting piece, and the rod body connecting piece is generally a combination of a hoop and a nut, so that the insulating cross arm 10 is fixedly connected with a rod body.

The sealing part comprises a first seal 113 and a second seal 114, the first seal 113 and the second seal 114 are both arranged in the inner cavity of the sleeve 111, the outer peripheral surface of the first seal 113 and the outer peripheral surface of the second seal 114 are matched with the inner wall of the sleeve 111, and the cross section of the first seal 113 and the cross section of the second seal 114 are shown in figure 3. The first seal 113 is located at an end portion where the sleeve 111 and the first mandrel 121 are connected and fixed, the second seal 114 is located at an end portion where the sleeve 111 and the second mandrel 122 are connected and fixed, and the first seal 113 and the second seal 114 are located outside the two first mounting holes 112 on the axis of the insulating cross arm 10. When the core rod 120 is fixedly connected with the link fitting 110, one end of the first core rod 121 is sleeved on one end of the sleeve 111 and abutted against the first seal 113, one end of the second core rod 122 is sleeved on the other end of the sleeve 111 and abutted against the second seal 114, so that the first core rod 121 and the second core rod 122 are both connected with the sleeve 111 in a sealing manner, the protective sleeve 111 is sealed with the interfaces between the first core rod 121 and the second core rod 122, and impurities such as water vapor are prevented from entering the inner cavity of the sleeve 111 through the first mounting hole 112, so that the first core rod 121 and the second core rod 122 are corroded, and the mechanical performance and the electrical performance of the first core rod 121 and the second core rod 122 are reduced. Meanwhile, the first seal 113 and the second seal 114 are both metal plates or rubber members, and when the first seal 113 and the second seal 114 are metal plates, the first seal 113 and the second seal 114 are respectively fixed in the inner cavities at two ends of the sleeve 111 by welding, so that the first seal 113 and the second seal 114 form a seal with the inner wall of the sleeve 111; when the first seal 113 and the second seal 114 are rubber members, the first seal 113 and the second seal 114 are respectively inserted into the inner cavities at the two ends of the sleeve 111, liquid glue is applied to the peripheries of the first seal 113 and the second seal 114, which are in contact with the inner wall of the sleeve 111, and after standing and curing, the first seal 113 and the second seal 114 are sealed with the inner wall of the sleeve 111, so that impurities such as external water vapor cannot enter the inner cavity of the sleeve 111 through the first mounting hole 112, the end parts of the first core rod 121 and the second core rod 122 can be protected from being corroded, and the mechanical performance and the electrical performance of the first core rod 121 and the second core rod 122 can be ensured.

In this embodiment, the sealing portion includes a first seal 113 and a second seal 114, in other embodiments, the sealing portion may also be a single body, that is, after the first core rod 121 and the second core rod 122 are fixedly connected to the link fitting 110 and the wire hanging fitting 140, respectively, a member to be coated is formed, and then the member to be coated is integrally coated with an insulating layer 130, where the insulating layer 130 is a rubber material, and the rubber material fills the inner cavity of the sleeve 111 through the first mounting hole 112, so that the first core rod 121 and the second core rod 122 form a seal with the inner cavity of the sleeve 111, thereby playing a role of protecting the first core rod 121 and the second core rod 122.

Furthermore, a cushion block 115 is arranged on one side face of the sleeve 111, and the sleeve 111 is fixedly connected with the cushion block 115 through welding, so that the structure is stable, and the operation is simple and convenient. The upper end surface of the cushion block 115 and the upper end surface of the sleeve 111 are located in the same plane, and the lower end surface of the cushion block 115 and the lower end surface of the sleeve 111 are located in the same plane, so that a sufficient contact area is maintained when the link fitting 110 is connected with a rod body, and the connection of the insulating cross arm 10 and the rod body is more stable. The pad 115 is located between the two first mounting holes 112 for facilitating the mounting operation, and the pad 115 has an arc-shaped surface recessed toward the inner side of the sleeve 111 for being coupled with the rod body. In this embodiment, the concave surface of the pad 115 is arc-shaped, and in other embodiments, the concave surface of the pad 115 may also be triangular or rectangular, as long as it can be matched with a rod body with a corresponding shape. Meanwhile, the outer surface of the cushion block 115 also needs a zinc coating layer, so that the surface of the cushion block 115 is prevented from being corroded, and the service life is prolonged.

Furthermore, in this embodiment, the sleeve 111 is further provided with a top phase hole 116, and the top phase hole 116 is located in the middle of the upper end of the sleeve 111 and is used for connecting a top phase insulator to adapt to a wire support of the single-loop power transmission line; of course, the top phase hole 116 may not be provided for supporting the conducting wire of the single-circuit transmission line, and two insulating cross arms are installed on the transmission pole, one insulating cross arm 10 is adopted, and the other insulating cross arm is connected with the first mandrel 121 and the wire hanging fitting 140 only on one side of the connecting fitting 110. In other embodiments, the top phase hole 116 may not be provided for supporting the wires of the dual-circuit transmission line, and in this case, three insulating cross arms 10 may be provided in the vertical direction of the transmission pole.

The connection mode of the wire-hanging hardware 140 and the core rod 120 is the same as the connection mode of the connection hardware 110 and the core rod 120, and is not described herein again, the end of the wire-hanging hardware 140 further includes a sleeve body and a flange (not shown in the figure) which is arranged around the sleeve body and connected with the sleeve body, so that the insulating layer 130 is coated at the connection interface of the core rod 120 and the wire-hanging hardware 140, the sealing between the core rod 120 and the wire-hanging hardware 140 is ensured, and water vapor is prevented from entering the core rod 120 to corrode the core rod 120, thereby avoiding reducing the mechanical performance and the electrical performance of the core rod 120.

In the insulating cross arm 10 provided by this embodiment, two core rods are used as insulating load-bearing main materials, which are the first core rod 121 and the second core rod 122, respectively, the connecting hardware 110 is used in the middle of the insulating cross arm 10, and the left and right ends of the connecting hardware 110 are sleeved with the first core rod 121 and the second core rod 122, respectively, so that the connecting hardware 110 can be directly provided with mounting holes, and can be connected with a rod body without punching holes on the core rod 120 or adopting a connecting device with a complex structure, and without more than two rod body connecting pieces, so that the mounting process of the insulating cross arm 10 is simplified, and the working efficiency is improved. The link fitting 110 is formed by welding steel pipes, and has the advantages of convenient material acquisition, simple structure, easier forming mode, simple process, high efficiency and strong designability. Meanwhile, the wire-hanging hardware 140 is sleeved at both ends of the insulating cross arm 10 for fixing and connecting the wires, and the insulating layer 130 is coated on the insulating cross arm 10 except the connecting hardware 110 and the end wire-hanging hardware 140 to protect the core rod 120 and prevent the core rod from aging. Compared with the prior art, the insulating cross arm 10 has the advantages of reduced material consumption, simple process, reduced cost and suitability for various rod bodies.

Example two:

as shown in fig. 4 and 5, the insulating cross arm 20 of the present embodiment has a similar structure to the insulating cross arm 10 of the first embodiment, except that the connection fitting 210 of the insulating cross arm 20 includes a sleeve 211 and an angle iron 212, the sleeve 211 has the same structure as the sleeve 111 of the first embodiment, the sleeve 211 is a steel pipe with a hollow structure, two first mounting holes 213 are further provided on the sleeve 211 along the axial direction of the insulating cross arm 20, and the sleeve 211 is disposed to fit the inner side wall of the angle iron 212. Meanwhile, two second mounting holes 214 corresponding to the two first mounting holes 213 are formed in the angle steel 212, the sleeve 211 is attached to the angle steel 212, and after the two first mounting holes 213 and the two second mounting holes 214 are matched, a rod body connecting piece is penetrated through and generally combined by a hoop and a nut, so that the insulating cross arm 20 is fixedly connected with the rod body. And, the outer surface of sleeve 211 and angle steel 212 all need the galvanizing coat, prevents that the surface of sleeve 211 and angle steel 212 from being corroded, increase of service life.

A cushion block 215 is arranged on one outer side wall of the angle steel 212, and the angle steel 212 is fixedly connected with the cushion block 215 in a welding mode, so that the structure is stable, and the operation is simple and convenient. The upper end surface of the cushion block 215 and the upper end surface of the outer side wall of the angle steel 212 are located in the same plane, and the lower end surface of the cushion block 215 and the lower end surface of the outer side wall of the angle steel 212 are located in the same plane, so that the sufficient contact area is kept when the link fitting 210 is connected with the rod body, and the insulating cross arm 20 is connected with the rod body more stably. The pad 215 is located between the two second mounting holes 214 for facilitating the mounting operation, and the pad 215 has an arc-shaped surface recessed toward the inner side of the outer side wall of the angle iron 212 for being connected with the rod body in a matching manner. In this embodiment, the concave surface of the pad 215 is arc-shaped, and in other embodiments, the concave surface of the pad 215 may also be triangular or rectangular, as long as it can match with a rod body with a corresponding shape. Meanwhile, the outer surfaces of the angle steel 212 and the cushion block 215 also need to be galvanized, so that the surface of the cushion block 215 is prevented from being corroded, and the service life is prolonged.

Similar to the first embodiment, the sleeve 211 is further provided with a top phase hole 216 for connecting a top phase insulator, and the function is similar to that of the top phase hole 116 in the first embodiment, and is not described again. Meanwhile, a third mounting hole 217 corresponding to the top phase hole 216 is formed in the other side wall of the angle steel 212, the sleeve 211 is attached to the angle steel 212, and after the top phase hole 216 and the third mounting hole 217 are matched, a top phase insulator is placed, so that the top phase insulator is fixedly connected to the insulating cross arm 20.

The beneficial effects of the insulating cross arm 20 provided in this embodiment are similar to those of the insulating cross arm 10 in the first embodiment, and are not described again. Meanwhile, the connecting hardware fitting 210 of the insulating cross arm 20 is matched with the angle steel 212 through the sleeve 211, a steel pipe with a thinner wall thickness can be selected as the sleeve 211, the size of the sleeve 211 can be reduced, the cost is reduced, when the angle steel 212 is damaged, the angle steel 212 can be directly replaced, the insulating cross arm 20 does not need to be integrally replaced, and the operation and maintenance cost is reduced.

Example three:

referring to fig. 1, the present embodiment provides a method for manufacturing an insulating cross arm 10, including the following steps:

s101: a first core rod 121, a second core rod 122, a connecting fitting 110, and two wire attaching fittings 140 are formed.

The first core rod 121 and the second core rod 122 are formed by pultrusion of glass fiber impregnated epoxy resin, of course, a die pressing or other forming method can be adopted, the preferred scheme is a pultrusion process, and the core rod formed by pultrusion has good mechanical property and electrical property and low cost. Meanwhile, the first core rod 121 and the second core rod 122 may have a circular, square, T-shaped, or i-shaped shape.

The connecting hardware fitting 110 and the two wire hanging hardware fittings 140 are formed by welding and are cast at one time, and the outer surfaces of the connecting hardware fitting 110 and the wire hanging hardware fitting 140 are required to be galvanized, so that the hardware fitting is prevented from being corroded, and the service life is prolonged. The connecting hardware fitting 110 formed by welding has a simple structure, a simple and convenient fixing mode, convenient material drawing and suitability for industrial application. The one-step casting forming wire hanging hardware fitting 140 is simple in structure, easy in forming mode, capable of being formed in one step for any complex structure, simple in process, high in efficiency and strong in designability.

S102: a seal portion is provided in the sleeve 111 of the link fitting 110 and sealed and fixed.

The sealing part comprises a first seal 113 and a second seal 114, the first seal 113 and the second seal 114 are respectively positioned at two ends of the inner cavity of the sleeve 111 and positioned outside the two first mounting holes 112 on the axis of the insulating cross arm 10, and the first seal 113 and the second seal 114 are metal plates or rubber pieces. A first seal 113 and a second seal 114 are respectively arranged in the inner cavities at two ends of the sleeve 111, and when the first seal 113 and the second seal 114 are metal plates, the first seal 113 and the second seal 114 are fixed in the inner cavity of the sleeve 111 by welding; when the first seal 113 and the second seal 114 are rubber members, the first seal 113 and the second seal 114 are respectively inserted into the inner cavities at the two ends of the sleeve 111, liquid glue is applied to the peripheries of the first seal 113 and the second seal 114, which are in contact with the inner wall of the sleeve 111, and the first seal 113 and the second seal 114 are kept still and cured to form a seal. Therefore, impurities such as external moisture cannot enter the inner cavity of the sleeve 111 through the first mounting hole 112, the end portions of the first core rod 121 and the second core rod 122 can be protected from corrosion, and the mechanical performance and the electrical performance of the first core rod 121 and the second core rod 122 are ensured.

S103: one end of the first core rod 121 is fixedly connected with one end of the sleeve 111 in a sealing manner, one end of the second core rod 122 is fixedly connected with the other end of the sleeve 111 in a sealing manner, and the other end of the first core rod 121 and the other end of the second core rod 122 are fixedly connected with the two wire hanging fittings 140 respectively to form a piece to be coated.

The first core rod 121 and the second core rod 122 are fixedly connected with the connecting hardware fitting 110 and the wire hanging hardware fitting 140 in a crimping mode, so that the connection is reliable, the process is simple, the production efficiency is high, and the cost is low. One end of the first mandrel 121 abuts against the first seal 113, and one end of the second mandrel 122 abuts against the second seal 114, so that the interface seal between the mandrel 120 and the link fitting 110 is ensured. In order to further ensure the interface sealing between the first core rod 121 and the second core rod 122 and the link fitting 110 and the wire fitting 140, before the first core rod 121 and the second core rod 122 are respectively pressed against the link fitting 110 and the wire fitting 140, a sealing ring may be placed on the end portions of the first core rod 121 and the second core rod 122.

In the present embodiment, the first core rod 121 and the second core rod 122 are fixed to the link fitting 110 and the wire fitting 140 by crimping, and in other embodiments, the first core rod 121 and the second core rod 122 are fixed to the link fitting 110 and the wire fitting 140 by gluing. Specifically, when the gluing fixing is adopted, glue is coated in the inner cavity of the sleeve 111 of the link fitting 110, and then the glue is buckled at one end of the first core rod 121 and one end of the second core rod 122, one end of the wire-hanging fitting 140 is also provided with a sleeve, glue is coated in the inner wall cavities of the sleeves at the ends of the two wire-hanging fittings 140, and then the glue is buckled at the other end of the first core rod 121 and the other end of the second core rod 122 respectively, so that the first core rod 121 and the second core rod 122 are fixedly connected with the link fitting 110 and the two wire-hanging fittings 140 respectively through solidification. Or after the link fitting 110 is fastened to one end of the first core rod 121 and one end of the second core rod 122, glue is injected through glue injection holes arranged at the end portions of the link fitting 110, and finally the first core rod 121 and the second core rod 122 are fixedly connected with the link fitting 110 through curing, and the connection of the wire-hanging fitting 140 is performed in the same manner, which is not described again.

S104: an insulating layer 130 is integrally coated on the member to be coated, and the insulating layer 130 coats the first core rod 121 and the second core rod 122 except for other areas of the connecting hardware 110 and the wire hanging hardware 140, so that the insulating cross arm 10 is obtained.

The insulating layer 130 is preferably a silicone rubber material, which has good aging resistance and hydrophobic migration property, and can significantly prevent the occurrence of pollution flashover and rain flashover, although the insulating layer 130 may also be made of other types of rubber materials. The coating mode adopts an integral injection process, the cost is low, the efficiency is high, and before the insulation layer 130 is integrally injected, the coupling agent is coated on the first core rod 121 and the second core rod 122, so that the bonding performance of the silicon rubber with the first core rod 121 and the second core rod 122 is better. And because the integral injection process is adopted, the insulating layer 130 naturally forms a sealing connection with the connecting fitting 110 and the wire hanging fitting 140 after injection molding. Of course, the coating mode can also adopt a mould pressing process, and the silicon rubber insulating layer can be integrally formed.

The preparation method of the insulating cross arm 10 provided by the embodiment can also be used for preparing the insulating cross arm 20, the whole process steps are few, the process is simple, the cost of pultrusion and one-time crimping is low, and the labor cost and the energy consumption can be reduced. The integral injection makes the sealing performance of the product better, and the silicon rubber insulating layer 130 makes the insulating cross arm 10 have better external insulating performance and aging resistance.

Example four:

referring to fig. 1, the present embodiment provides another method for manufacturing an insulating cross arm 10, including the following steps:

s201: a core rod preform, a connecting hardware 110, two wire hanging hardware 140 and a plurality of insulating sheds are formed.

The forming manner of the core rod preform, the connecting hardware 110 and the two wire hanging hardware 140 is similar to that of step S101 in the third embodiment, and details are not repeated here.

The insulating umbrella skirt can be a silicon rubber umbrella skirt, and also can be an umbrella skirt made of other rubber materials. In the embodiment, a plurality of silicon rubber insulating sheds in a single piece form are formed by high-temperature vulcanization.

S202: the outer surface of the core rod prefabricated member is uniformly coated with a layer of insulating sheaths with the same thickness, the core rod prefabricated member is cut to form a first core rod 121 and a second core rod 122 coated with the insulating sheaths, glue is uniformly coated in the inner cavities of a plurality of single insulating sheds, then the insulating sheds are sleeved on the insulating sheaths of the first core rod 121 and the second core rod 122 according to a certain arrangement sequence, and the insulating sheaths and the insulating sheds jointly form an insulating layer 130.

The insulating sheath is extruded to cover the outer surface of the core rod prefabricated member, in the embodiment, the insulating sheath is a silicon rubber sheath, and in other embodiments, the insulating sheath can also be a sheath made of other rubber materials. After the insulating sheath is wrapped, the first core rod 121 and the second core rod 122 are cut to a desired length.

After the single silicon rubber umbrella skirt is coated with glue solution, namely adhesive, the single silicon rubber umbrella skirt penetrates through the through hole in the middle of the silicon rubber umbrella skirt to be fixed on the silicon rubber sheath, and the continuous silicon rubber umbrella skirt is formed.

S203: a seal portion is provided in the sleeve 111 of the link fitting 110 and sealed and fixed.

The manner of disposing the sealing portion in the inner cavity of the link fitting 110 is similar to the step S102 in the third embodiment, and is not repeated herein.

S204: one end of the first core rod 121 and one end of the second core rod 122 are both fixedly connected with the connecting hardware fitting 110, and the other end of the first core rod 121 and the other end of the second core rod 122 are respectively fixedly connected with the two wire hanging hardware fittings 140, so as to obtain the insulating cross arm 10.

After the end portions of the first core rod 121 and the second core rod 122 coated with the insulating layer 130 are trimmed, the end portions are respectively fixedly connected with the connecting hardware 110 and the wire hanging hardware 140, in a manner similar to that in step S103 of the third embodiment.

S205: sealing is performed at the interface connection positions of the first core rod 121 and the second core rod 122, the connection fitting 110, and the wire fitting 140.

The interface connection part comprises a compression joint part of two ends of the first core rod 121 and the connecting hardware fitting 110 and the wire hanging hardware fitting 140 respectively, and two ends of the second core rod 122 and the compression joint part of the connecting hardware fitting 110 and the wire hanging hardware fitting 140 respectively, and the interface connection part is coated with room temperature vulcanized silicone rubber and is subjected to standing and curing to form sealing, so that the sealing effect is further improved.

The method for manufacturing the insulating cross arm 10 provided in this embodiment can also be used for manufacturing the insulating cross arm 20, and is different from the third embodiment in a molding process of a silicone rubber shed, where the molding process of this embodiment is called as an extrusion wrapping umbrella, and the process is to extrude and connect a longer core rod preform and silicone rubber in advance to form a silicone rubber sheath to wrap the outer surface of the core rod preform, so that the silicone rubber sheath is wrapped continuously and uniformly, and thus the interface performance between the core rod preform and the silicone rubber sheath is good. And then cutting the core rod prefabricated part to form a first core rod 121 and a second core rod 122 with required lengths, and further sleeving a silicon rubber shed on the first core rod 121 and the second core rod 122 coated with the silicon rubber sheaths to form an insulating layer 130, so that the production efficiency can be improved, and the cost can be reduced.

Example five:

s301: a first core rod 121, a second core rod 122, a connecting fitting 110, and two wire attaching fittings 140 are formed.

The forming manner of the first core rod 121, the second core rod 122, the connecting hardware 110 and the two wire hanging hardware 140 is similar to that of step S101 in the third embodiment, and is not described again here.

S302: one end of the first core rod 121 and one end of the second core rod 122 are respectively and fixedly connected with two ends of the sleeve 111 of the connecting hardware fitting 110, and the other end of the first core rod 121 and the other end of the second core rod 122 are respectively and fixedly connected with two wire hanging hardware fittings 140 to form a piece to be coated.

The forming manner is similar to step S103 of the third embodiment, and is not described herein again.

S303: the insulating layer 130 is entirely coated on the member to be coated, the insulating layer 130 is filled in the inner cavity of the link fitting 110 to form a sealing portion, and the insulating layer 130 coats the first mandrel 121 and the second mandrel 122 except other regions of the link fitting 110 and the wire hanging fitting 140, so as to obtain the insulating cross arm 10.

The material of the insulating layer 130 is the same as that of the insulating layer 130 in the third embodiment, and is a rubber material, and the covering manner is also the same, which is not described herein again. Meanwhile, before the insulating layer 130 is coated, a coupling agent is coated in the inner cavity of the link fitting 110, so that the sleeve 111 and the insulating layer 130 have better adhesive performance, the insulating layer 130 is made of a rubber material, and when the insulating layer 130 is coated, the rubber material fills the inner cavity of the link fitting 110 through the first mounting hole 112, so that the first core rod 121, the second core rod 122 and the inner cavity of the link fitting 110 are sealed, and thus the first core rod 121 and the second core rod 122 are protected, and the first core rod 121 and the second core rod 122 are hermetically connected with the sleeve 111.

The method for manufacturing the insulating cross arm 10 provided in this embodiment may also be used for manufacturing the insulating cross arm 20, and the difference from the third embodiment is that a sealing portion is formed by filling a rubber material in an inner cavity of the sleeve 111 of the link fitting except for a portion connected to the first core rod 121 and the second core rod 122, and the rod connector is inserted into the first mounting hole 112 by hollowing out the rubber material in the first mounting hole 112, so that the insulating cross arm 10 is fixedly connected to the rod. The process is simpler and more convenient to operate, the product has better sealing performance due to integral injection, the interface between the core rod 120 and the connecting hardware fitting 110 can be sealed, the production efficiency can be improved, and the cost can be reduced.

Example six:

as shown in fig. 6, the present embodiment provides a power transmission pole 01, which includes a pole body 11, an insulating cross arm 10 fixed on the pole body 11, and a pole body fixing member 12, wherein the insulating cross arm 10 adopts the insulating cross arm 10 in the first embodiment. The insulating cross arm 10 further includes a connecting fitting 110, and two first mounting holes (not shown in the figure) are formed in the connecting fitting 110 along the axial direction of the insulating cross arm 10. The rod body fixing part 12 comprises a U-shaped hoop 13 and a fastening part 14, the fastening part 14 comprises a nut and a flat washer which are matched, the U-shaped hoop 13 and the fastening part 14 fix the insulating cross arm 10 on the rod body 11 through two first mounting holes, a metal insert (not shown in the figure) can be additionally arranged in the two first mounting holes, the main body of the metal insert is cylindrical, the size of the metal insert is matched with that of the first mounting holes, so that the metal insert is accurately mounted, the metal insert further comprises a flanging which is positioned at one end of the main body of the metal insert and forms an included angle of 90 degrees with the main body of the metal insert, the outer surface of the connecting hardware fitting 110 is prevented from being abraded by the rod body fixing part 12, meanwhile, the installation is convenient, and the stable connection of the insulating cross arm 10. The insulating cross arm 10 further includes a top phase hole (not shown in the figure) provided on the link fitting 110, and a top phase insulator is fixedly connected to the top phase hole, so that a three-phase wire can be hooked.

Example seven:

as shown in fig. 7, the present embodiment provides a power transmission pole 02, similar to the power transmission pole 01 of the fifth embodiment, except that the insulating cross arm 20 of the second embodiment is used as the insulating cross arm fixed to the power transmission pole 02. The insulating cross arm 20 comprises a link fitting 210, the link fitting 210 comprises a sleeve 211 and angle steel 212, and two first mounting holes (not shown in the figure) are symmetrically arranged on the link fitting 210 along the axis of the insulating cross arm 20. The power transmission pole 02 further comprises a pole body 21 and a pole body fixing part 22, the pole body fixing part 22 comprises a U-shaped hoop 23 and a fastening piece 24, the fastening piece 24 comprises a matched nut and a flat washer, the U-shaped hoop 23 and the fastening piece 24 fixedly connect an angle steel 212 and a sleeve 211 through two first mounting holes, so that the insulating cross arm 20 is fixed on the pole body 21, a metal insert (not shown in the figure) can be additionally arranged in the two first mounting holes, the main body of the metal insert is cylindrical, the size of the metal insert is matched with that of the first mounting holes, accurate installation of the metal insert is guaranteed, the metal insert further comprises a flanging which is positioned at one end of the main body of the metal insert and forms an included angle of 90 degrees with the main body of the metal insert, abrasion of the outer surface of the connecting hardware fitting 210 caused by the pole body fixing part 22 is prevented, meanwhile, the installation is convenient, and.

While the invention has been described with reference to the above disclosure and features, it will be understood by those skilled in the art that various changes and modifications in the above constructions and materials can be made, including combinations of features disclosed herein either individually or in any combination, as appropriate, without departing from the spirit of the invention. Such variations and/or combinations are within the skill of the art to which the invention pertains and are within the scope of the following claims.

Claims

1. An insulating cross arm, comprising:

the connecting hardware comprises a sleeve and a sealing part arranged inside the sleeve;

the mandrel comprises a first mandrel and a second mandrel, one end of the first mandrel and one end of the second mandrel are fixedly connected to two ends of the sleeve respectively, and the sealing part enables one end of the first mandrel and one end of the second mandrel to be in sealing connection with the sleeve;

the two wire hanging hardware fittings are fixedly connected to the other end of the first core rod and the other end of the second core rod respectively;

the insulating layer is fixed on the outer peripheral surface of the core rod in a wrapping mode, the insulating layer is located in other areas except the connecting hardware fitting and the wire hanging hardware fitting, and the insulating layer is in sealing connection with the connecting hardware fitting and the insulating layer is in sealing connection with the wire hanging hardware fitting.

2. The insulating cross arm of claim 1, wherein the sleeve is a steel tube having a hollow structure.

3. The insulating cross arm of claim 1, wherein a spacer is provided on one side of the sleeve, the spacer having an arcuate surface that is concave toward the inside of the sleeve.

4. The insulating cross arm of claim 3, wherein the spacer is fixedly connected to the sleeve by welding.

5. The insulating cross arm of claim 1, wherein the sealing portion comprises a first seal and a second seal, the first seal and the second seal are made of a metal plate or a rubber, an outer circumferential surface of the first seal and an outer circumferential surface of the second seal are fitted to an inner wall of the sleeve, one end of the first mandrel abuts against the first seal, and one end of the second mandrel abuts against the second seal.

6. The insulating cross arm of claim 1, wherein the sealing portion is a rubber material, the sealing portion filling the sleeve lumen except for a portion connected to the first mandrel and the second mandrel.

7. The insulating cross arm of claim 1, wherein two first mounting holes are formed in the side wall of the sleeve along the axial direction of the sleeve, and both of the two first mounting holes are located between the first core rod and the second core rod.

8. The insulating cross arm of claim 7, wherein the link fitting further comprises an angle steel, and the sleeve is disposed to fit against an inner side wall of the angle steel.

9. The insulating cross arm as claimed in claim 8, wherein two second mounting holes corresponding to the two first mounting holes are formed in the angle iron, and a spacer is formed on an outer side wall of the angle iron, the spacer being located between the two second mounting holes and having an arc-shaped surface recessed toward an inner side of the sleeve.

10. The preparation method of the insulating cross arm is characterized by comprising the following steps:

one end of the first core rod is fixedly connected with one end of the sleeve in a sealing mode, one end of the second core rod is fixedly connected with the other end of the sleeve in a sealing mode, and the other end of the first core rod and the other end of the second core rod are fixedly connected with the two wire hanging hardware fittings respectively to form a piece to be coated;

11. The preparation method of the insulating cross arm is characterized by comprising the following steps:

fixedly connecting one end of the first core rod and one end of the second core rod with two ends of a sleeve of the connecting hardware fitting respectively, and fixedly connecting the other end of the first core rod and the other end of the second core rod with the two wire hanging hardware fittings respectively to form a piece to be coated;

and integrally coating an insulating layer on the piece to be coated, filling the insulating layer into an inner cavity of the connecting hardware fitting to form a sealing part, and coating the first core rod and the second core rod except other areas of the connecting hardware fitting and the wire hanging hardware fitting by using the insulating layer to obtain the insulating cross arm.

12. The utility model provides a power transmission pole, includes the body of rod and fixes insulating cross arm on the body of rod, its characterized in that: the insulating cross arm is as claimed in any one of claims 1 to 9.